8051 Instruction Set Manual

SWAP

The SWAP instruction exchanges the low-order and high-order nibbles within the accumulator. No flags are affected by this instruction.

See Also: XCH, XCHD

SWAP A
CACF0RS1RS0OV P
Bytes1
Cycles1
Encoding
11000100
Operation
SWAP
A3-0 swap A7-4
Example
SWAP A